Introducing an exciting lineup of sleek G-STEEL GSTB400 models, now available in stunning new color variations. These models boast improved designs, thanks to a thin module and carbon core guard structure. With the GSTB400BD-1A2, you'll find a striking black IP case and band, complemented by a mesmerizing blue vapor deposition dial. The incredible slimness of the GSTB400 is achieved through further miniaturization of parts and thinning of modules, all without compromising on Bluetooth or solar function. Not only that, but power consumption has been significantly reduced as well. What truly sets this model apart is its carbon core guard structure, allowing it to be the thinnest in the G-STEEL Series (as of Apr 2021) while maintaining exceptional impact resistance. With a thickness of just 12.9 mm from the back cover to the bezel top, it surpasses the GSTB100 model by over one millimeter. Prepare to be amazed by the fusion of elegance and durability in the new slim G-STEEL GSTB400 models.